<template>
  <div>
<!--    面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>

<!--    卡片视图区域-->
    <el-card>
<!--     2. 为 ECharts 准备一个具备大小（宽高）的Dom-->
      <div id="main" style="width: 750px; height: 400px;"></div>
    </el-card>
  </div>
</template>

<script>
  //1.导入echarts
  import echarts from 'echarts'
  import _ from 'lodash'

  export default {
    data(){
      return {
        //需要合并的数据
        options:{
          title:{
            text: '用户来源'
          },
          tooltip:{
            trigger: 'axis',
            axisPointer:{
              type: 'cross',
              label:{
                backgroundColor: '#E9EEF3'
              }
            }
          },
          grid:{
            left: '3%',
            right: '4%',
            bottom: '3%',
            containLabel: true
          },
          xAxis: [
            {
              boundaryGap: false
            }
          ],
          yAxis: [
            {
              type: 'value'
            }
          ]
        }
      }
    },
    create(){},
    //此时，页面上的元素已经被渲染完毕了
    async mounted() {
      //3.基于准备好的dom，初始化echarts实例
      var myChart = echarts.init(document.getElementById('main'))

      const{data:res} = await this.$http.get(`reports/type/1`)
      if(res.meta.status !== 200){
        return this.$message.error('获取折线图数据失败！')
      }

      //4.准备数据和配置项
      const result = _.merge(res.data, this.options)

      //5.展示数据
      myChart.setOption(res.data)
    },
    methods:{}
  }
</script>

<style lang="less" scoped>

</style>